Water-tube boiler



PATENTED JAN. 26, 1904.

T. W. JOHNSON. WATER TUBE BOILER.

APPLICATION FILED MAR. 17, 1903.

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N0."750,28-6. PATENTED JAN. 26, 1904. T. W. JOHNSON.

WATER TUBE BOILER.

APPLICATION FILED MAR. 17, 1903.

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UNITED STATES Patented January 26, 1904.

PATENT OFFICE.

WATER-TUBE BOILER.

SPECIFICATION forming part of Letters Patent No. 750,286, dated January26, 1904.

Application filed March 1'7, 1903.

To all whom, it may concern:

Be it known that I, THoMAs W; J OHNSON, a citizen of the United States,residing in the city and county of San Francisco, State of California,have invented certain new and useful Improvements in Water-Tube Boilers;and I do hereby declare the following to be a full, clear, and exactdescription of the same.

The present invention relates to an improved water-tube boiler for useas a marine or as a stationary boiler, the essential features of theinvention residing in so constructing the boiler as to entirelywater-jacket the inner tube-cylinder of the boiler and in thearrangement of the heat-fines whereby the hot products of combustioncompletely envelop the waterjacket cylinder as conveyed from the innertube-cylinder toward the outlet-stack for the utilized products ofcombustion.

By the hereinafter-described construction of a water-tube boiler themaximum heating-surface for the circulating water is obtained, theexpensive heat-retaining covering ordinarily employed to protect theouter wall or shell of the boiler being dispensed with.

To comprehend the invention, reference should be had was accompanyingsheets of drawings, wherein Figure 1 is a front view in elevation of theboiler, partly broken away. Fig. 2 is a broken perspective view of theboiler. Fig. 3 is a hori- Zontal sectional plan view taken through Fig.1 of the drawings on the line 02 00. Fig. 4 is a similar view taken onthe line e 'U of Fig. 1 of the drawings, and Fig. 5 is a; detailsectional view of the rear end plate or wall for the water-jacketcylinder or shell.

The numeral 1 is used to indicate the waterjacket cylinder, within whichis arranged an inner tube-cylinder 2, which is considerably smaller thanthe outer cylinder 1. Through this inner cylinder extends a series ofwatercirculating tubes or flues 3, which tubes are run at aninclination. Each tube 3 projects through the end walls 4 5 of thecylinder 2, so as to communicate with the water-circulating chamber 6which surrounds or envelops the said cylinder 2.

Within the cylinder 2,near the bottom thereof, is located the grate 7.The distance exist- Serial No. 148,150. (No model.)

ing between the bottom series of tubes or fiues 3 and the upper surfaceof the grate 7 may be said to constitute the fire-box 8 for the improvedboiler.

From the inner cylinder 2, near the top thereof, extend from each sidethereof a series of laterally-projecting flues 9 10 for the outlet ofthe hot products of combustion. These lines connect, respectively, withthe heat-circulating flues 11 12, which flues are formed between theouter wall of the cylinder 1 and the inner wall of the inclosing shell13. These heat :circulating fiues are closed at one end and successivelyalternate as to the discharge thereof, the discharge end of the fiues 11being substantially diametrically opposite to the discharge end ofthefiues 12. Each flue communicates with and discharges into theoutlet-chamber 14 for the stack 15. The heat entering thecirculatingfines 11 from the outlet-fines 9 is conveyed around thecylinder 1 and discharged into the outlet-chamber l t at pointssubstantially opposite the receiving end of the said fines, while theheat entering the circulating-fines 12 from outletfiues 10 is caused tocirculate around the cylinder 1 in an opposite direction to the heatcirculating through the flues 11, the heat passing through the flues 12being discharged into the outlet-chamber Mat points substantiallyopposite the receiving ends thereof. The hot products of combustion fromwithin the inner cylinder 2 are thus distributed and caused to circulatein opposite directions entirely around the outer "cylinder 1. By thisarrangement the watercirculating through the Water-tubes 3is heated bythe hot produets of combustion bearing directly upon the tubes withintheinner cylinder 2, the said tube being enveloped by the heat, whilethe water circulating within the water space or chamber 6 is maintainedheatedby the hot' products of combustion circulating around andenveloping the cylmder 1. The water is thus evenly heated throughout,and as the pressure is evenly distributed inside and outside of theinner cylinder bulging of the walls, due to expansion and contraction,is obviated.

In order that the water may be fed into the boiler at a raisedtemperature, a water-tank is formed at each side by means of thetankshells 16 16, attached to the sides of the outer shell 13.ater-receiving tanks or compartments 17 are thus provided into which thewater is received for feeding to the boiler. The water within thesetanks or compartments is maintained heated by the heated wallof theshell 13, which is heated by the hot products of combustion bearingagainst the inner face thereof as circulating within the flues 11 12.

The upper portion of the water-space 6, or that portion immediatelyabove the top of the inner cylinder 2, forms a contracted steamchamber6. Owing to the smallness of this chamber it is deemed advisable tointroduce within the outlet-chamber 14 of the stack 15 a steam-drum 7,which drum communicates with the chamber 6' by means of the connection8.

To give proper rigidity or stiffness to the ends or heads of thecylinders, the ends 4 4c and the ends 5 5 are united by a series ofstaybolts 8 The space below the grate 7 forms an ashpit 9, from whichthe ashes are withdrawn through the opening 10. Fuel is delivered intothe fire-box 8 through the openings 12 12 These openings are closedby-the doors 13, while the ash-pit opening is closed by the door 14. Toform these openings, corresponding openings are formed in the face ofthe cylinder heads or ends 4 4: The metal surrounding the openings ofthe end or head 4 is outwardly flared, while that surrounding theopenings of the end or head 4 is inwardly flared. The projecting flanges2 2 thus formed overlap when the ends or heads are positioned and arehammered, riveted, or otherwise united.

To the inner face of each head or end 4 5 a series of disks 3 aresecured by means of the bolts 3 passing therethrough, which bolts areheld in place by the nuts 2 secured to the projecting end thereof. Adisk 3 is provided for each water-tube 3, which disks when the ends orheads 4 5 are in position come directly opposite the open ends of thesaid tubes. These disks cover tube-openings 4: in the ends or heads, thepurpose of which is to enable a leaky or defective water-tube to beeasily removed or withdrawn for the purpose of inserting a perfect oneorto enable the tubes to be readily cleaned of scale which may haveaccumulated therein. To withdraw a watertube, it is only required toremove a disk 3' corresponding to the position of the tube. The tubebeing released from its cylinder 2 the same is slipped from place andpassed out through one of the uncovered openings 4 To clean thewater-tubes, the disks 3 of one of the heads or ends are removed, whenaccess may be had to the said tubes.

The front end or head 4 is provided with the manholes 17, through whicha workman enters to gain access to the interior of the boiler. Thesemanholes are formed in the same manner as the openings for the fire-boxand the ash-pit.

Having thus described the invention, what is claimed as new, and desiredto be protected by Letters Patent, is-

1. In a boiler for the described purpose, the combination with the outercylinder, of an inner water-tube cylinder arranged therein, awater-space surrounding the inner cylinder with which the tubes of saidcylinder communicate, and heat-flues arranged to convey the hot productsof combustion entirely around the outer cylinder, said flues connectingwith the interior of the inner cylinder by means of laterally-extendingflues leading therefrom.

2. A boiler for the described purpose, the same comprising an inner andan outer cylinder, a water-circulating space existing between the wallsof the cylinders, a series of water-circulating tubes extendinglongitudinally through the inner cylinder and communicating with thewater-circulating space, a series of heat-circulating flues surroundingthe outer cylinder, said flues communicating with an outlet-chamber atalternate sides of the outer cylinder, and a series oflaterallyextending flues leading from the inner cylinder at oppositesides and alternately connecting with the heat-circulating flues of theouter cylinder.

3. A boiler for the described purpose, the same comprising an inner andan outer cylinder, a water-circulating space existing between the innercylinder and the outer cylinder, a series of water-tubes extendingthrough the inner cylinder and communicating with the water-circulatingspace, and heat-circulating flues surrounding the outer cylinder forreceiving the hot products of combustion from the inner cylinder atopposite points and discharging the same into an outlet to the stack atpoints opposite to the receiving-points.

4:. A boiler of the character described, the same comprising an innercylinder and an outer cylinder, the ends or heads of said cylindersbeing united, a water-circulating space between the walls of the saidcylinders, watercirculating tubes extending longitudinally through theinner cylinder, and communicating with the water-space, and a series ofheatcirculating flues surrounding the outer cylinder, said fluescommunicating with the inner cylinder from opposite sides.

5. A boiler of the character described, the same comprising an inner andan outer cylinder, a water-circulating space between the inner cylinderand the outer, and heat-circulating flues surrounding the outer cylinderfor receiving the products of combustion from the inner cylinder andleading the same in opposite directions around the outer cylinder.

6. A boiler of the character described, the same comprising an innercylinder and an outer cylinder, a water-circulating space between theinner cylinder and the outer cylinder, a steanrdrum communicating withthe interior of the outer cylinder and heat-circulating fluessurrounding the outer cylinder, said fines receiving the hot products ofcombustion from the inner cylinder and conveying the same in oppositedirections around the outer cylinder.

7. The combination with an outer cylinder, of an inner cylinder arrangedtherein, a Water-circulating space between the inner and the outercylinders, water-tubes extending through the inner cylinder andcommunicating with the water-circulating space, heat-circulating fluesfor leading the products of combustion from the inner cylinder andconveying the same around the outer cylinder in opposite directions.

8. In a boiler of the described character,

the combination with an outer cylinder, of an inner cylinder arrangedtherein, a Water-circulating space between the cylinders, a series ofWater-tubes extending through the inner cylinder and communicating withthe Watercirculating space, a series of heating-fines surrounding theouter cylinder, said flues cornmunicating with and receiving theproducts of combustion from the inner cylinder at opposite points, andWater-receiving compartments which receive the feed-Water for theboiler. v

In1 Witness whereof I have hereunto set my hanc.

THOMAS W. JOHNSON.

Witnesses:

N. A. AoKER, D. B. RICHARDS.

